Which of the following best describes why radio telescopes are generally much larger in size than telescopes designed to collect visible light?
A) Getting an image of the same angular resolution requires a much larger telescope for radio waves than for visible light.
B) Radio telescopes are designed to collect sound rather than light.
C) It is because radio telescopes are used in the daytime and visible light telescopes are used at night.
D) Objects that emit radio waves are always much larger than objects that emit visible light, and therefore require larger telescopes.
A
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Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?
A) a physical change B) a chemical change C) a molecular change D) a decomposition E) none of the above
Which of the following applications is not suitable for a titanium alloy?
(a) Human body implants (b) Parts in saltwater, such as a ship propeller (c) high strength low weight parts (d) a gas turbine part at 700°C (1292°F)
A spinning ice skater is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)
A) Her angular momentum remains almost constant. B) Her moment of inertia remains almost constant. C) Her kinetic energy remains almost constant. D) She is subject to a constant non-zero torque.
Two identical objects A and B fall from rest from different heights to the ground and feel no appreciable air resistance. If object B takes TWICE as long as object A to reach the ground, what is the ratio of the heights from which A and B fell?
A) hA/hB = 1/ B) hA/hB = 1/2 C) hA/hB = 1/4 D) hA/hB = 1/8